they just need to change the categories from I believe the current 6 or 8 to 3 to 4 for crowd controls. I seriously don't see how a horrify is not a fear...and doesn't share that DR as an example. I am perfectly fine with the amount of CC, just not the different types. Also fear should break on damage period as well as all CC. The point is crowd control not keep someone out of the game long enough while still continually damaging them 50% hp through dots. Stuns are the only one I believe people should be able to take damage while it is still up, however it was brought up once you take a certain %age the stun wears off.
As was said, the thing I would take out is the cooldown reset abilities some classes have....like rogues for example...if you counter their initial setup they can just vanish and start over....that shouldn't happen. Also I would take away permanent stealth. Guild wars stealth mechanic IMO was flawless. You needed to be quick when you went stealth if you were going for damage or you got the hell out of there just as fast. It should not be a permanent thing, also they could scale rogues differently IF they went with that. Lastly unless you are a rogue you get no invisibility/stealth like mages do now even if it is a set duration. It should be reverted back to you can cast it, but once you are invis you can't see anything but your team mates.